SBAS780B December   2016  – March 2021 ADS8661 , ADS8665

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements: Conversion Cycle
    7. 6.7  Timing Requirements: Asynchronous Reset
    8. 6.8  Timing Requirements: SPI-Compatible Serial Interface
    9. 6.9  Timing Requirements: Source-Synchronous Serial Interface (External Clock)
    10. 6.10 Timing Requirements: Source-Synchronous Serial Interface (Internal Clock)
    11. 6.11 Timing Diagrams
    12. 6.12 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input Structure
      2. 7.3.2 Analog Input Impedance
      3. 7.3.3 Input Protection Circuit
      4. 7.3.4 Programmable Gain Amplifier (PGA)
      5. 7.3.5 Second-Order, Low-Pass Filter (LPF)
      6. 7.3.6 ADC Driver
      7. 7.3.7 Reference
        1. 7.3.7.1 Internal Reference
        2. 7.3.7.2 External Reference
      8. 7.3.8 ADC Transfer Function
      9. 7.3.9 Alarm Features
        1. 7.3.9.1 Input Alarm
        2. 7.3.9.2 AVDD Alarm
    4. 7.4 Device Functional Modes
      1. 7.4.1 Host-to-Device Connection Topologies
        1. 7.4.1.1 Single Device: All multiSPI Options
        2. 7.4.1.2 Single Device: Standard SPI Interface
        3. 7.4.1.3 Multiple Devices: Daisy-Chain Topology
      2. 7.4.2 Device Operational Modes
        1. 7.4.2.1 RESET State
        2. 7.4.2.2 ACQ State
        3. 7.4.2.3 CONV State
    5. 7.5 Programming
      1. 7.5.1 Data Transfer Frame
      2. 7.5.2 Input Command Word and Register Write Operation
      3. 7.5.3 Output Data Word
      4. 7.5.4 Data Transfer Protocols
        1. 7.5.4.1 Protocols for Configuring the Device
        2. 7.5.4.2 Protocols for Reading From the Device
          1. 7.5.4.2.1 Legacy, SPI-Compatible (SYS-xy-S) Protocols with a Single SDO-x
          2. 7.5.4.2.2 Legacy, SPI-Compatible (SYS-xy-S) Protocols With Dual SDO-x
          3. 7.5.4.2.3 Source-Synchronous (SRC) Protocols
            1. 7.5.4.2.3.1 Output Clock Source Options
            2. 7.5.4.2.3.2 Output Bus Width Options
    6. 7.6 Register Maps
      1. 7.6.1 Device Configuration and Register Maps
        1. 7.6.1.1 DEVICE_ID_REG Register (address = 00h)
        2. 7.6.1.2 RST_PWRCTL_REG Register (address = 04h)
        3. 7.6.1.3 SDI_CTL_REG Register (address = 08h)
        4. 7.6.1.4 SDO_CTL_REG Register (address = 0Ch)
        5. 7.6.1.5 DATAOUT_CTL_REG Register (address = 10h)
        6. 7.6.1.6 RANGE_SEL_REG Register (address = 14h)
        7. 7.6.1.7 ALARM_REG Register (address = 20h)
        8. 7.6.1.8 ALARM_H_TH_REG Register (address = 24h)
        9. 7.6.1.9 ALARM_L_TH_REG Register (address = 28h)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Supply Decoupling
    2. 9.2 Power Saving
      1. 9.2.1 NAP Mode
      2. 9.2.2 Power-Down (PD) Mode
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.6.1.4 SDO_CTL_REG Register (address = 0Ch)

This register controls the data protocol used to transmit data out from the SDO-x pins of the device.

Figure 7-35 SDO_CTL_REG Register
31302928272625242322212019181716
Reserved
R-0000h
1514131211109876543210
ReservedGPO_VALReservedSDO1_
CONFIG
[1:0]		ReservedSSYNC_CLKReservedSDO_
MODE[1:0]
R-000bR/W-0bR-00bR/W-00bR-0bR/W-<0>bR-0hR/W-<0>b
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset; -0, -1 = Condition after application reset;
-<0>, -<1> = Condition after power-on reset
Address for bits 7-0 = 0ChAddress for bits 15-8 = 0DhAddress for bits 23-16 = 0EhAddress for bits 31-24 = 0Fh
Table 7-14 SDO_CTL_REG Register Field Descriptions
BitFieldTypeResetDescription
31-16ReservedR0000hReserved. Reads return 0h.
15-13ReservedR000bReserved. Reads return 000b.
12GPO_VALR/W0b1-bit value for the output on the GPO pin.
11-10ReservedR00bReserved. Reads return 00b.
9-8SDO1_CONFIG[1:0]R/W00bTwo bits are used to configure ALARM/SDO-1/GPO:
00b = SDO-1 is always tri-stated; 1-bit SDO mode
01b = SDO-1 functions as ALARM; 1-bit SDO mode
10b = SDO-1 functions as GPO; 1-bit SDO mode
11b = SDO-1 combined with SDO-0 offers a 2-bit SDO mode
7ReservedR0bReserved. Reads return 0b.
6SSYNC_CLK(1)R/W0bThis bit controls the source of the clock selected for source-synchronous transmission.
0b = External SCLK (no division)
1b = Internal clock (no division)
5-2ReservedR0000bReserved. Reads return 0000b.
1-0SDO_MODE[1:0]R/W00bThese bits control the data output modes of the device.
0xb = SDO mode follows the same SPI protocol as that used for SDI; see the SDI_CTL_REG register
10b = Invalid configuration
11b = SDO mode follows the ADC master clock or source-synchronous protocol
(1) This bit takes effect only in the ADC master clock or source-synchronous mode of operation.